High-integrity container sealing material and its preparation method and application

Abstract

The invention discloses a sealing material for a container with high integrity and a preparation method as well as an application thereof. The sealing material comprises 78.4 to 117.6 parts of cement, 2.96 to 18.4 parts of polymer emulsion, 80 to 120 parts of sand, 6.85 to 21.35 parts of water, 0.24 to 1.2 parts of water reducing agent, 1.6 to 19.2 parts of swelling agent and 0.44 to 2.76 parts of curing agent. The sealing material is high in denseness strength, high in fluidity, free of shrinkage, high in irradiation resistance and high in durability. The sealing material is grouted into a sealing cavity between a barrel cover and a barrel body of the container with the high integrity by using an air pressure grouting method. After the sealing material is hardened, the barrel cover and the barrel body of the container with the high integrity can be combined to form the whole structure, so that nuclear waste materials in the container cannot leak within 300 years. The sealing material can be applied to the fields of nuclear waste treatment and building structure restoration.

Description

Technical field [0001] The present invention relates to a sealing material for solidification of nuclear waste in nuclear power generation, in particular to a sealing material with high bonding strength, radiation resistance and high durability suitable for high-integrity containers, and a preparation method and its use in nuclear waste treatment In the application. Background technique [0002] In view of the increasing emphasis on greenhouse gas emissions and climate warming in the world today, actively promoting nuclear power generation is an important policy of China’s energy construction. Nuclear power generation has low pollutant emissions and is a clean energy source; it will not cause aggravation of the global greenhouse effect. Carbon dioxide; nuclear fuel has high energy density, small size, and convenient transportation and storage; among the cost of nuclear power generation, fuel costs account for a low proportion and are not easily affected by the international econo...

AI Technical Summary

Problems solved by technology

The traditional nuclear waste solidification technology is often based on the principle of "multiple barriers". Steel structures, concrete structures and their composite structures are used as "buffer materials" to shield the radioactivity of nuclear waste. This process has the disadvantage that the disposal unit is too large to be safely processed. Surveillance's fatal flaw

Traditional nuclear waste concrete or fiber-reinforced concrete containers suffer from insufficient toughness and poor "cold bonding" between the container cover and the container body

At present, all countries in the world are researching high-integrity containers for nuclear waste. The high-integrity container technology can directly place the solidified nuclear waste in the container, and mainly adopts a one-time integral pouring technology. This technology can simplify multiple barriers, without The disadvantage of landfilling underground is that the use of one-time integral pouring will result in less nuclear waste placement. Therefore, a combination of high-integrity container lid and barrel body is used to increase the placement of nuclear waste. The sealing material for the connection between barrels has become the focus of researchers' research

However, there are very few studies and applications of sealing materials for high-integrity container filling, and most of them are confidential. There are no literature reports so far, and there is no sealing material technology with a safe life of 300 years. Sealing materials for the perfusion of permanent containers is a top priority, which will provide strong support for the construction of nuclear power projects and their long-term, safe and stable operation after completion

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